/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "platform/text/BidiTextRun.h"

#include "platform/text/BidiResolver.h"
#include "platform/text/TextRunIterator.h"

namespace blink {

TextDirection directionForRun(TextRun& run, bool* hasStrongDirectionality)
{
    if (!hasStrongDirectionality) {
        // 8bit is Latin-1 and therefore is always LTR.
        if (run.is8Bit())
            return LTR;

        // length == 1 for more than 90% of cases of width() for CJK text.
        if (run.length() == 1 && U16_IS_SINGLE(run.characters16()[0]))
            return directionForCharacter(run.characters16()[0]);
    }

    BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
    bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
    bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
    return bidiResolver.determineDirectionality(hasStrongDirectionality);
}

TextDirection determineDirectionality(const String& value, bool* hasStrongDirectionality)
{
    TextRun run(value);
    return directionForRun(run, hasStrongDirectionality);
}

TextRun textRunWithDirectionality(const String& value, bool* hasStrongDirectionality)
{
    TextRun run(value);
    TextDirection direction = directionForRun(run, hasStrongDirectionality);
    if (hasStrongDirectionality)
        run.setDirection(direction);
    return run;
}

} // namespace blink

